“…4 Generally, the phosphors most commonly used in LEDs are fluorides, sulphides, silicates, oxides, nitrides, and oxynitrides. However, some problems are found with these phosphors, limiting their applications in LEDs, that is, fluoride- and sulphide-based phosphors are very sensitive to moisture, making luminescent intensity dramatically degrade; 5–7 silicate- and oxide-based phosphors have low emission efficiency and so with difficulty are used for high-efficiency LEDs; 8–11 and nitride- and oxynitride-based phosphors exhibit serious thermal degradation, 2,12–14 which causes a short life time for the LED devices.…”